Source : Webster's Revised Unabridged Dictionary (1913)

Plump \Plump\ (pl[u^]mp), a. [Compar. {Plumper} (-[~e]r);
   superl. {Plumpest}.] [OE. plomp rude, clumsy; akin to D.
   plomp, G., Dan., & Sw. plump; probably of imitative origin.
   Cf. {Plump}, adv.]
   Well rounded or filled out; full; fleshy; fat; as, a plump
   baby; plump cheeks. --Shak.

         The god of wine did his plump clusters bring. --T.
                                                  Carew.